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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f1715b8e4d9d8bbe7ef80a60e008ea4d6d27b1deb78d63ad5e5f9161e43197' 
  AND token = 'Tdl07AJfbqeeIaYmpgK/LL9eRZMdpta3W2TM/NzYadc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}